Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0c174a539a0c95…

MALICIOUS

PDF

75.8 KB Created: 2021-06-02 21:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: eee8c9f38d1311c4a31ff65fe8941a6a SHA-1: eb9b1df582b34b0bfb9f0981eae3a3d1afab4a38 SHA-256: 4f0c174a539a0c9584722e649b581185951a2f0d7b6ee3d6667de99726b9ecb8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute malware or phishing content through these links. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crysiq.ru/pbw?utm_term=axolotl+julio+cortazar+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501206/normal_5fe9096e9e1df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418778/normal_600c74104d165.pdfIn PDF document text
    • https://rirudelibuwa.weebly.com/uploads/1/3/1/6/131606594/c89b0cdbfbe795d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450140/normal_6063f95ab59e5.pdfIn PDF document text
    • https://bikujezojodu.weebly.com/uploads/1/3/4/5/134587809/wolopopurafafa.pdfIn PDF document text
    • https://zexivavu.weebly.com/uploads/1/3/4/8/134872555/komebexupuzevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471988/normal_60494283a5287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489583/normal_5fd808a18f93d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409420/normal_605ef659b0d06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495841/normal_5fed9ac717dfa.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450732/normal_60b1ea4991124.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411503/normal_6008236f39ae0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415309/normal_6000c4a72a821.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392442/normal_5febb140e385c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a8475b-fbb2-4a77-b273-11deb5f19a6f/norinekegokatago.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/ptv_sports_live_official_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1954672-1fab-43f3-824d-968842eed3b1/best_drinking_coffee_quotes.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144413793/ravpower_filehub_password_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa14f951-2553-4acd-97ee-8d9a2cf6f1a0/what_was_the_little_albert_experiment_and_what_did_it_show_researchers_about_classical_conditioning.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB5 5156 bytes
SHA-256: 90bd18a6c623a222f1b03093a56b7cfa8161a7917720841eeaa4a8fc37cb512a
font_01_sfnt_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 10948 bytes
SHA-256: ed339191cf758eeac06b06255dd84d875dd01ed558ba5ade1c3b59b9d1f6a09c

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